International Commission on Zoological Nomenclature. Opinion 356 Addition to the Official List of Family-group Names Zoology of the names of the family-group taxa having Ostrea Linnaeus, 1758, and Gryphaea Lamarck, 1801 (class Pelecypoda) as their respective type genera (Opinion supplementary to Opinion 338).Opinions and declarations rendered by the International Commission on Zoological Nomenclature 11(6), 103-112 (1955)